It was the 5th century BC.
Plato lived from around 427 to 347 BCE in ancient Greece.
3 BC falls in the 1st century BC. The 1st century BC spans from 100 BC to 1 BC, with the year 1 BC being the last year of that century. Thus, 3 BC is the third year of the 1st century BC.
The Year 776 BC was in the 8th century BC.
The year 320 BC is in the 4th century BC. The 4th century BC spans from the year 400 BC to 301 BC. Therefore, 320 BC falls within this range, specifically in the later part of the century.
The year 867 BC, as with any year between 900 BC and 801 BC, falls in the ninth century BC.
1101 BC was the last year of the 12th century BC.
The year 340 BC is classified as the 4th century BC.
10 BC was in the first century BC.
6th century BC.
the 1st century BC
The 10th century BC.
The year 1001 BC, as with any year between 1099 BC and 1000 BC, fell in the eleventh century BC.